The Electoral College ensures that every four years the race for the White House comes down to a few state battlegrounds that ultimately decide the winner. But those battlegrounds can change and in the last five presidential elections they have moved more than people think.
This year there were eight states where the presidential results were especially tight, less than a 5 point difference between the winner and loser in each. But since 2004, 20 different states have been in that group within 5 points, and the change in the states on the list reveals something about the changing nature of the American electorate. CONTINUED
Dante Chinni, NBC News
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